News:
I have designed many whistles, you can find them in my Whistle Collection.
These are just a few of my latest designs:

WARNING:
This is an emergency whistle and not a toy! It's extremely loud which can harm the ears, so please protect your ears and don't use it near other people or animals!

Update 2023-03-24:
I've designed an even louder, lower-pitched variant of this whistle that you can download here.

Summary
This keychain compatible emergency whistle is a variant of my big Emergency Whistle - much smaller, but almost as loud as it's big brother.

How to print:
All Slicers:
Use a line width of 0.4 mm and a layer height of 0.2 mm, 5 top layers and 5 bottom layers. Don't use support and don't change the given orientation of the object!

The whistle requires correct positioning of the Z-seam - it shouldn't be placed in the narrow air passages inside the whistle. The Z-seam should be positioned as shown in the images above (the white dots represent the Z-seam). Use the “Z Seam Alignment: User specified” option in Cura or the "Seam Painting" option in PrusaSlicer to achieve this.

Print slowly to achieve sharp edges (max. 30 mm/s for walls).

PrusaSlicer:
Use default settings and manually paint the z-seam as in the pictures above.

Cura Slicer:

• Wall Line Count: 2
• Extra Infill Wall Count: 1
• Z-Seam Relative: ON
• Z-Seam X: 0
• Z-Seam Y: -50
• Enable Bridge Settings: ON
• Bridge Wall Coasting: 0%
• Bridge Wall Flow: 100%
• Bridge Skin Flow: 70%
• Bridge Has Multiple Layers: OFF

Do you like it?
If you have printed this design and you like it, I would be happy if your make is uploaded.